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march 2011 doc id 16998 rev 3 1/19 19 L6520 l6521 highly integrated ballast controller for tl and cfl features half bridge circuit able to drive both bjt and mosfet transistors very accurate oscilla tor precision in wide operating temperature range bjts' storage time compensation preheated start and instant start hard switching protection overcurrent / voltage protection choke saturation control end-of-life protection programmable without capacitors applications electronic ballasts (tl, industrial cfl) integrated cfls table 1. device summary order codes package packaging L6520 so8 tube L6520tr tape and reel l6521 tube l6521tr tape and reel so8 figure 1. block diagram 9&& +6' /6' +%&6 *1' 3:0bghw (2/ )35( 9 9 6wduw8s 89/2 9ff ,qwhuqdo9 5hj 9 $'& /2*,& &25( ,1 9 9 9 9ff 7[0 7[/ 7[+ 7kuhvkrog08; &&&%orfn 9 9 9ff x$ www.st.com
contents L6520, l6521 2/19 doc id 16998 rev 3 contents 1 description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 functions description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 5.1 start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 5.2 preheating and instant start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 5.3 ignition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 5.4 run mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 5.5 storage time compensation network . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 5.6 current control circuit (ccc) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 5.6.1 hard switching protection (hsp) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 5.6.2 overcurrent protection (ocph) during ignition mode . . . . . . . . . . . . . . 11 5.6.3 overcurrent protection (ocpl) during run mode . . . . . . . . . . . . . . . . . . 11 5.6.4 choke saturation control (csc) during ignition and run mode . . . . . . . 12 5.7 end of life (eol) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 5.8 summary of protections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 6 typical electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 7 application examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 8 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 9 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
L6520, l6521 description doc id 16998 rev 3 3/19 1 description the L6520/1 is the first highly integrated ballast controller in the market able to drive both bjts and mosfets, providing all the necessary protections to ensure the maximum reliability of the applicatio n in compliance with major sa fety and power consumption regulations. by adopting bjts switches in the application, the ic allows to replace more expensive mosfets, strongly reducing the system cost without compromises. the ic represents also the best and cost effective solu tion to replace self oscillating solutions when the key requirem ent is the reliability of the ballast. the benefits are an increased mtbf and a reduction of the costs due to the return from the field. the higher level of flexibility a nd integration provided allows the possibility to quickly design ballast with any kind of lamp topology/size/power, without limitations. depending on the power of the lamp, the ic can work without pfc, with passive pfc or with active pfc. in the latter case the l6562a from stmicroelectronics is the suggested ic for the most cost effective solution. the ic is fully programmable using only resistors and offers over current protections, choke saturation control and hard switching protection thanks to a sophisticated current control circuit (ccc). in ignition, the ccc limits both the maximum lamp voltage in case of old or broken lamp, and also the lamp current in case of inductor saturation. when the ic is driving bipolar transistors, a variable dead time ensures the correct base discharge time avoiding cross conduction phenomena. moreover, the ic prevents the failure due to the lamp's end of life (eol).
pin connection L6520, l6521 4/19 doc id 16998 rev 3 2 pin connection figure 2. pin connection table 2. pin description symbol pin description fpre 1 preheating frequency programming and ignition modes selection eol 2 window comparator input hbcs 3 current sensing input pwm_det 4 half bridge middle point monitor gnd 5 ic power and signal ground lsd 6 low side driver output hsd 7 high side driver output vcc 8 power supply )35( (2/ 3:0bghw +%&6 *1' /6' +6' 9&&
L6520, l6521 maximum ratings doc id 16998 rev 3 5/19 3 maximum ratings table 3. absolute maximum ratings symbol pin parameter co nditions value unit v z 8 active clamp protection voltage active clamp protection must not be supplied by a low impedance voltage source 18.5 v i vcc 8 active clamp protection current during low consumption state 2 ma v od1 6,7 differential voltage between driver output and v cc v od1 = v cc ? v out (1) 18.5 v v od2 6,7 differential voltage between driver output and gnd v od2 = v out ? gnd (1) 18.5 v v fpre 1 fpre positive voltage 5 v v fpre 1 fpre negative voltage -0.3 v v pwm_det 4 pwm_det pin positive voltage pwm_det input current < 5ma 5.1 v v pwm_det 4 pwm_det pin negative voltage pwm_de t output current < 0.1ma -0.3 v v hbcs 3 hbcs positive voltage 5 v v hbcs 3 hbcs negative voltage hbcs output current < 2ma -5 v v eol,max 2 eol positive voltage eol input current < 5ma 5 v v eol,min 2 eol negative voltage eol output current < 0.1ma -0.3 v 1. v out refers to the voltage at either lvg pin or hvg pin table 4. thermal data symbol description value unit r thja max. thermal resistance junction to ambient 150 c/w t j junction operating temperature range -40 to 150 c t stg storage temperature -55 to 150 c
electrical characteristics L6520, l6521 6/19 doc id 16998 rev 3 4 electrical characteristics (a) v cc = 16 v, t a = -25 c to 85 c, unless otherwise specified a. this is a preliminary version: all the paramet ers are subject to change table 5. electrical characteristics symbol pin parameter test condition min. typ. max. unit supply voltage v cc vcc operating range after turn-on (1) 10.5 v z v v cc(on) vcc turn-on threshold 13.5 15 16.5 v v cc(off) vcc turn-off threshold 10.5 11.5 12.5 v v z vcc zener voltage i z = 2 ma 16.5 17.5 18.5 v supply current i st-up vcc start-up current before turn-on, (v cc = 13 v) 130 200 a i cc vcc operating supply current no load 8 10 ma i q vcc quiescent current idle mode, (2) 150 220 a timing and oscillator d output duty cycle run mode 49.5 50 50.5 % t dead fixed dead time (3) 1.24 1.42 1.6 s f run hb run frequency t amb = 25 c 46 46.6 47.2 khz 43.2 47.8 khz f pre max programmable preheating frequency r fpre = 24.9 k ? 96 100 104 khz t pre preheating time r fpre 196 ? , (1) , (4) , L6520 1.5 s r fpre 196 ? , (2) , (4) , l6521 0.8 f ins hb instant start initial frequency fpre connected to gnd, (2) 85 khz df ign /dt ignition time frequency sweep rate (4) , t amb = 25 c -2.75 khz/ms df ccc /dt frequency sweep rate after overcurrent (4) , t amb = 25 c -500 hz/ms i fpre fpre fpre current reference t amb = 25 c 200 202 204 a 192 204 t on,min hsd lsd minimum half bridge on time t amb = 25 c 1 s half bridge drivers v ol hsd lsd output low voltage iload = 300 ma 3 v
L6520, l6521 electrical characteristics doc id 16998 rev 3 7/19 v oh hsd lsd output high voltage iload = 300 ma 13 v i src hsd lsd peak source current 300 ma i snk hsd lsd peak sink current 300 ma t rise hsd lsd rise time cload = 1 nf 120 ns t fall hsd lsd fall time cload = 1 nf 120 ns i pd hsd lsd pull down current before turn-on, (v cc = 13v) v lsd or v hsd = 1v 20 ma storage time compensation and hard switching detection v outup pwm_det pwm detector threshold positive going hb middle point 2.65 3 v v hsw pwm_det hard switching detector threshold negative going hb middle point 2 2.35 v v p_dclamp pwm_det clamping voltage i pwm_det = 2 ma 4.5 5 5.5 v t hsw pwm_det max. time of hard switching operation (4) , t amb = 25 c 200 ms half bridge current control circuit (ccc) thl hbcs first threshold in ignition mode 0.96 1 1.04 v thm hbcs second threshold in ignition mode 1.21 1.26 1.31 v thh hbcs third threshold in ignition mode 2.4 2.5 2.6 v tll hbcs first threshold in run mode 0.67 0.7 0.73 v tlm hbcs second threshold in run mode 0.87 0.9 0.93 v tlh hbcs third threshold in run mode 1.7 1.8 1.9 v t prot maximum current control time (4) , t amb = 25 c 200 ms t1 hbcs minimum interval between two consecutive threshold crossing for slow events (4) , t amb = 25 c 510 ns t2 hbcs minimum interval between two consecutive threshold crossing for fast events (not saturating) (4) , t amb = 25 c 255 ns ? f txl hbcs frequency increase in case of lower threshold crossing (4) , t amb = 25 c 1 khz ? f slow hbcs frequency increase in case of slow event (4) , t amb = 25 c 1 khz ? f fast hbcs frequency increase in case of fast event (4) , t amb = 25 c 2 khz table 5. electrical characteristics (continued) symbol pin parameter test condition min. typ. max. unit
electrical characteristics L6520, l6521 8/19 doc id 16998 rev 3 t leb hbcs leading edge time after lsd turn on (4) , t amb = 25 c 255 ns end of life v eol eol eol pin biasing voltage reference 2.43 2.5 2.57 v v eol_h eol eol upper threshold 3.84 4 4.16 v v eol_l eol eol lower threshold 0.96 1 1.04 v i eol eol sink/source capability v eol = 1.5v (source) v eol = 3.5v (sink) 8.2 9.1 10 a t eol eol protection delay time (4) , t amb = 25 c 1.5 s 1. during the operation at vcc vz the maximum supply current must be limited to 2ma. 2. guaranteed by characterization. 3. t dead is the sum of a fixed time, generated by internal logic and the propagation delay of pwm_det comparator. 4. guaranteed by testi ng logic verification. table 5. electrical characteristics (continued) symbol pin parameter test condition min. typ. max. unit
L6520, l6521 functions description doc id 16998 rev 3 9/19 5 functions description 5.1 start-up during the first start-up ramp of the supply voltage (v cc ) both driver outputs, lsd and hsd, are low impedance to ground (isink 20 ma min). once the v cc voltage reaches the turn-on voltage v cc(on) the ic starts its operation. during the first 100 s the ic senses the status of fpre pin to detect the programmed preheating frequency and the selected ignition mode (instant or preheated start). when all the ic internal functions are ready, the driver-outputs are released . if the preheated start is selected, the half-brid ge oscillates at the pr ogrammed preheating frequency, otherwise it starts from 85 khz (typ.). 5.2 preheating and instant start the preheating time is 1.5 s (typ.) in the L6520 and 0.8 s (typ.) in the l6521. the fpre pin embeds a precise current reference: the voltage read by this pin sets the preheating frequency or enables the instant start. if the fpre pin is connected to ground, the instant start is active and the ic runs immediately into ignition sequence from the starting frequency of 85 khz . if the pin fpre is connected to a resistor equal or higher than 196 ? , the preheating frequency can be programmed from 55 khz upward s till 100 khz (1.5 khz/step) accordingly to table 6 . for the best precision the resistor tolerance should be less or equal to 1%. after the preheating sequence, the ic runs into ignition mode . table 6. preheating and instant start f pre (khz) r fpre ( ? ) f pre (khz) r fpre ( ? ) instant start 0 77.5 5490 55 196 79 6190 56.5 383 80.5 6980 58 576 82 7870 59.5 806 83.5 8660 61 1050 85 9530 62.5 1300 86.5 10500 64. 1580 88 11500 65.5 1870 89.5 12700 67 2210 91 14000 68.5 2550 92.5 15400 70 2940 94 16900 71.5 3400 95.5 18700 73 3830 97 20500 74.5 4320 98.5 22600 76 4870 100 24900
functions description L6520, l6521 10/19 doc id 16998 rev 3 5.3 ignition during the ignition sequence the output frequency ramps down from the programmed preheating frequency to the fixed run frequency with a fixed rate df ign /dt of - 2.75 khz/ms. if the instant start is selected, the frequency ramps down from 85 khz to 46.6 khz (typ.) with the same rate. the current control circuit limits the maximum lamp voltage (ocph) in case of old or broken lamp and it is able to control the lamp current in case of inductor saturation (csc). the ignition phase lasts for maximum 200 ms. if the run frequency is not reached during ignition phase, the ic is turned off (latched). 5.4 run mode the run frequency is internally set to 46.6 khz . the hsd and lsd pins drive respectively th e high side and the low side switches. the potential isolation to the high side switch is realized by a pulse transformer. the hsd and lsd drivers are able to manage the inductive load represented by the primary side of the pulse transformer. between the turn-off of one driver and turn-on of the other one there is a dead time automatically optimized accordingly to the kind of the half bridge switches (mos or bjt) to ensure the maximum reliability. the ccc protects the circuit against over currents, choke saturation and hard switching events. 5.5 storage time compensation network in all the operating states (preheating, ignition and run mode), the storage time compensation ensures the application of the fixed dead time (t dead , 1.42 us typ.) once the bjt's collector current is effectively reduced to zero. the t dead is the sum of a fixed time, generated by internal logic and the propagation delay of pwm_det comparator. the voltage level of the middle point of the half bridge is monitored through the pwm_det pin: the high side switch is turned on after a fixed dead time from the instant when the voltage on the pwm_det pin is above 2.65 v. the time between the falling edge of pin lsd and the rising edge of hsd is recorded in order to set the same dead time between the falling edge of pin hsd and th e rising edge of pin lsd. the minimum duration of the resulting on time is internally limited to 1 s. this condition can last for a maximum time equal to 200 ms. after this time the ic is shut down (latched). the pwm_det pin embeds a 5 v (typ.) clamping zener, allowing the connection between the half bridge middle point and the pin itself by means of a limiting resistor. when driving mosfet no storage time is present, therefore the resulting dead time is equal to (1.42 s).
L6520, l6521 functions description doc id 16998 rev 3 11/19 5.6 current control circuit (ccc) the current control circuit (ccc) is a sophistica ted circuit able to protect the ballast against any possible failure. it limits the maximum lamp voltage during ignition (ocph), overcurrent protection (ocpl) during run mode, chokes saturation control (csc) and hard switching protection (hsp). the control circuit senses the voltage on hbcs pin and pwm_det pin . figure 3 on page 13 shows the ccc protections active in each operating mode (preheating, ignition and run): 5.6.1 hard switching protection (hsp) if the voltage on pwm_det pin is higher than 2.35 v at the moment the ls driver turns on, an up-down event counter is increased and an internal timer is started. without hard switching events, the counter decreases at every cycle and the timer is reset when 0 is reached. if the events counter value is higher than 0 after 200 ms from the detection of the first event , then the ic is turned off (latched). 5.6.2 overcurrent protection (ocph) during i gnition mode the protection results in lamp voltage limitation during ignition. in this phase three thresholds are active (thl, thm and thh): if the first threshold is crossed the frequency is increased by 1 khz during the next cycle . the interval between the crossings of the two lower thresholds (thl and thm) is used as an indication of the slope of the half bridge curr ent: if this interval is longer than t1 = 510 ns the event is considered ?slow? and the frequency is increased by another 1 khz/cycle during the next cycle. if the interval is shorter than t1 = 510 ns but longer than t2 = 255 ns, the event is considered ?fast? and the frequency is increased by another 2 khz/cycle during the next cycle . if no further threshold crossing is detected , the frequency is decreased with a fixed rate equal to df ccc /dt = - 500 hz/ms, until the frequency at which the lowest threshold was crossed firstly is reached; then, the decreasing ratio becomes again df ign /dt. if the run frequency has not been reached within 200 ms after the lower threshold was crossed the first time, the ic is turned off (latched). a leading edge blanking of 255 ns is active . 5.6.3 overcurrent protec tion (ocpl) during run mode the behavior of the ocpl is similar to the ocph but with reduced thresholds (tll, tlm and tlh) since the current involved in this phase is smaller. if no further threshold crossing is detected, the frequency is decreased with a fixed rate equal to d fccc /d t = - 500 hz/ms, until the run frequency is reached. if the run frequency has not been reached after 200 ms from when the lower threshold was crossed the first time, the ic is turned off (latched). a leading edge blanking of 255 ns is active.
functions description L6520, l6521 12/19 doc id 16998 rev 3 5.6.4 choke saturation control (csc ) during igniti on and run mode the same thresholds used to detect ocph and ocpl are active. the control is still based on the time between two consecutive thresholds but its behavior is different with respect to the ocph/ocpl detection to take into account the increase of di/dt when the inductor is saturating. when either the two lower thresholds are crossed in a time shorter than 255 ns or the higher threshold is crossed, the ls driver is immediately turned off and the time between the ls turn on and the instant when the second threshold (thm or tlm) is crossed is used to calculate the new (higher) frequency. if this new frequency is higher than 100 khz then the new fr equency will be set at 100 khz. the frequency is then decreased with a fixed df/dt equal to df ccc /dt = - 500 hz/ms , until the frequency at which the first threshold was crossed is reached. then, the decreasing ratio becomes again df ign /dt during ignition whereas , during run mode , the df ccc /dt decreasing ratio is maintained until run frequency is reached. if the run frequency has not been reached after 200 ms from when the lower threshold was crossed the first time, the ic is turned off (latched). a leading edge blanking of 255 ns is active. 5.7 end of life (eol) an embedded window comparator can be used to detect the end of life (eol) when the lamp is directly connected to ground (lamp to ground configuration). after the ignition sequence, the eol window comparator becomes active. when the voltage at eol pin goes outside the limits of this comparator a 1.5 s timer is started. if the eol pin voltage does not return inside the allowed range before the end of the timer, the ic is shut down (latched). the eol pin is biased to the center of the window comparator by means of an ota (2.5 v typ. with +/- 1.5 v typ. window) , having a current capability equal to 9.1 a (typ.).
L6520, l6521 functions description doc id 16998 rev 3 13/19 5.8 summary of protections figure 3. summary of protections n+] n+] gi ,*1 gw n+]pv vruv pv 35(+($7,1* lihqdeohg ,*1,7,21 58102'( n+] in+] 2&3+ &6& 2&3/ &6& +63 (2/ 0lq3xovh3urwhfwlrq w table 7. table of faults fault active during condition ic behaviour required action ph ign run minimum driving pulse duration 9 driving pulses shorter than 1 s - the drivers are stopped after 200 ms of minimum pulse duration events - the ic is shut down in low consumption mode v cc cycle inductor saturation 99 hbcs txl and txm thresholds crossed in less than 255 ns or higher threshold crossing ls driver turned off and a new frequency is calculated. if the situation is not recovered after 200 ms, the ic is shut down in low consumption mode v cc cycle hard switching 9 pwm_det higher than 2.35 v at lsd turn on ic is shut down in low consumption mode after 200 ms of hsw events v cc cycle overcurrent 99 hbcs txl and txm thresholds crossing (different values during ignition or run mode) frequency increase proportional to the failure. if the situation is not recovered after 200 ms the ic is shut down in low consumption mode v cc cycle end of life 9 eol voltage outside the limits of the window comparator - delay time started - if eol voltage is outside the limits of the window comparator at the end of the timer count than the ic is shut down (latched) v cc cycle
typical electrical characteristics L6520, l6521 14/19 doc id 16998 rev 3 6 typical electrical characteristics figure 4. vcc thresholds vs temperature figure 5. frequencies vs temperature figure 6. times vs temperature figure 7. fpre resistance converter temperature behavior figure 8. ieol vs temperature figure 9. lsg and hsg output voltage vs temperature (driver's current: 300ma) 8 10 12 14 16 18 20 -25 0 25 50 75 vcc voltage temperature [ c] vz vcc(on) vcc(off) 0.96 0.965 0.97 0.975 0.98 0.985 0.99 0.995 1 1.005 -25 0 25 50 75 normalized frequency temperature [ c] 0.995 1 1.005 1.01 1.015 1.02 1.025 1.03 1.035 1.04 -25 0 25 50 75 t ime intervals [normalized] temperature [ c] 4.975 4.98 4.985 4.99 4.995 5 5.005 5.01 194 195 196 197 198 199 200 201 202 203 -25 0 25 50 75 vref (v) ifpre [ua] temperature [ c] ifpre vref 9.05 9.1 9.15 9.2 9.25 9.3 9.35 9.4 9.45 -25 0 25 50 75 ieol (absolute value) [ua] temperature [ c] ieol (source) ieol (sink) 0 2 4 6 8 10 12 14 16 -25 0 25 50 75 vout_driver [v] temperature [ c] voh vol
L6520, l6521 application examples doc id 16998 rev 3 15/19 7 application examples figure 10. bjt application example figure 11. mosfet application example 5 +%&6 +9 5suh & 5(6 &fs & %/2&. / 5(6 &yff 5 ( 5 ( '= '= +6 /6 5vwxs (2/ 3:0bghw 9&& /6' +%&6 +6' *1' )35( 5 287 5 287 5 +%&6 +9 5suh & 5(6 &fs & %/2&. / 5(6 &yff 5 ( 5 ( '= '= +6 /6 5vwxs 5 287 (2/ 3:0bghw 9&& /6' +%&6 +6' *1' )35( 5 287
package mechanical data L6520, l6521 16/19 doc id 16998 rev 3 8 package mechanical data in order to meet environmental requirements, st offers these devices in different grades of ecopack ? packages, depending on their level of environmental compliance. ecopack ? specifications, grade definitions and product status are available at: www.st.com. ecopack is an st trademark. table 8. so-8 mechanical data dim. mm. inch min typ max min typ max a 1.35 1.75 0.053 0.069 a1 0.10 0.25 0.004 0.010 a2 1.10 1.65 0.043 0.065 b 0.33 0.51 0.013 0.020 c 0.19 0.25 0.007 0.010 d (1) 1. dimensions d does not include mold flash, protrusions or gate burrs. mold flash, potrusions or gate burrs shall not exceed 0.15mm (.006inc h) in total (both side). 4.80 5.00 0.189 0.197 e 3.80 4.00 0.15 0.157 e 1.27 0.050 h 5.80 6.20 0.228 0.244 h 0.25 0.50 0.010 0.020 l 0.40 1.27 0.016 0.050 k 0 (min.), 8 (max.) ddd 0.10 0.004
L6520, l6521 package mechanical data doc id 16998 rev 3 17/19 figure 12. package dimensions
revision history L6520, l6521 18/19 doc id 16998 rev 3 9 revision history table 9. document revision history date revision changes 19-jan-2010 1 initial release 08-feb-2011 2 added: l6521 option, section 6: typical electrical characteristics updated: coverpage, figure 1 , table 4 , table 5 , section 1 , figure 3 , table 7 , figure 10 , figure 11 09-mar-2011 3 datasheet updated from pr eliminary data to final datasheet
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